cPanel and WHM versions after 11.40 contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.
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Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-04-30), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.
cPanel and WHM versions after 11.40 contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.
April 29, 2026
May 4, 2026
Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41940MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
Working exploit code is in the public domain (9 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
CVE-2026-41940 is a critical authentication bypass vulnerability affecting cPanel and WHM. This repository is designed to demonstrate its Proof-Of-Concept
Open source ↗cPanel - CRLF Injection
Open source ↗CVE-2026-41940 Auto Root Login
Open source ↗cPanel/WHM Authentication Bypass (Zero-Day Vulnerability)
Open source ↗A security research tool for detecting and analyzing cPanel/WHM services and their authentication behavior. Designed for authorized testing and educational purposes only.
Open source ↗Bulk scanner and mass exploitation tool for CVE-2026-41940 on cPanel/WHM, built for automated target validation and high-speed multi-threaded execution.
Open source ↗CVE-2026-41940 — cPanel & WHM Authentication Bypass via Session-File CRLF Injection
Open source ↗A comprehensive Python utility to **detect**, **scan in bulk**, and **exploit** the critical authentication bypass vulnerability (CVE-2026-41940) in cPanel & WHM and WP Squared.
Open source ↗Detection, mitigation, and reverse-engineering tooling for CVE-2026-41940 (SessionScribe): the cPanel/WHM unauthenticated session-forgery vulnerability disclosed 2026-04-28. Defense-in-depth active mitigation shim, ModSec rule pack, remote probe, on-host IOC scanner, and per-tier RE snapshot collector. GPL v2.
Open source ↗See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-41940
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.
CWE-306